HARDMCQ SINGLEJEE Mains ChemistryInorganic Chemistryp-Block (group 13 and 14)Achiever Section

Assertion : BF3 is a weaker Lewis acid than BCl3. Reason : BF3 molecule is stabilized to a greater extent than BCl3 by B—F p-bonding.

A.A✓ Correct

B.B

C.C

D.D

Explanation

pp -pp back bonding in BF3 molecule there is (2p-2p) overlap resulting in stronger (pp -pp ) back bonding Whereas in BCl3 there is (2p-3p) overlap resultig in less stronger (pp -pp )back bonding as in BF3 the vacant p-orbitals of B-atom interacts with lone pair of F-atom Therefore lp's availability is reduced making BF3 a weaker base than BCl3

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master p-Block (group 13 and 14).

Start Free Practice →